The DB var in the comment should use :user instead of :username.
diff --git a/src/blog/config.clj b/src/blog/config.clj
--- a/src/blog/config.clj
+++ b/src/blog/config.clj
@@ -42,7 +42,7 @@
(def DB {:classname "org.postgresql.Driver"
:subprotocol "postgresql"
:subname "//localhost/blogtest"
- :username "blogtest"
+ :user "blogtest"
:password "blogtest"})
;; MySQL